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PART_NAME=firmware
# $(1): file to read magic from
# $(2): offset in bytes
get_magic_long_at() {
dd if="$1" skip=$2 bs=1 count=4 2>/dev/null | hexdump -v -e '1/1 "%02x"'
}
platform_machine() {
cat /proc/device-tree/compatible | tr '\0' '\t' | cut -f 1
}
platform_flash_type() {
# On NAND devices "rootfs" is UBI volume, so won't be find in /proc/mtd
grep -q "\"rootfs\"" /proc/mtd && {
echo "serial"
return
}
echo "nand"
}
platform_expected_image() {
local machine=$(platform_machine)
case "$machine" in
"netgear,r6250v1") echo "chk U12H245T00_NETGEAR"; return;;
"netgear,r6300v2") echo "chk U12H240T00_NETGEAR"; return;;
"netgear,r7000") echo "chk U12H270T00_NETGEAR"; return;;
"netgear,r8000") echo "chk U12H315T00_NETGEAR"; return;;
esac
}
platform_identify() {
local magic
magic=$(get_magic_long "$1")
case "$magic" in
"48445230")
echo "trx"
return
;;
"2a23245e")
echo "chk"
return
;;
esac
magic=$(get_magic_long_at "$1" 14)
[ "$magic" = "55324e44" ] && {
echo "cybertan"
return
}
echo "unknown"
}
platform_check_image() {
[ "$#" -gt 1 ] && return 1
local file_type=$(platform_identify "$1")
local magic
local error=0
case "$file_type" in
"chk")
local header_len=$((0x$(get_magic_long_at "$1" 4)))
local board_id_len=$(($header_len - 40))
local board_id=$(dd if="$1" skip=40 bs=1 count=$board_id_len 2>/dev/null | hexdump -v -e '1/1 "%c"')
local dev_board_id=$(platform_expected_image)
echo "Found CHK image with device board_id $board_id"
[ -n "$dev_board_id" -a "chk $board_id" != "$dev_board_id" ] && {
echo "Firmware board_id doesn't match device board_id ($dev_board_id)"
error=1
}
if ! otrx check "$1" -o "$header_len"; then
echo "No valid TRX firmware in the CHK image"
error=1
fi
;;
"cybertan")
local pattern=$(dd if="$1" bs=1 count=4 2>/dev/null | hexdump -v -e '1/1 "%c"')
local dev_pattern=$(platform_expected_image)
echo "Found CyberTAN image with device pattern: $pattern"
[ -n "$dev_pattern" -a "cybertan $pattern" != "$dev_pattern" ] && {
echo "Firmware pattern doesn't match device pattern ($dev_pattern)"
error=1
}
if ! otrx check "$1" -o 32; then
echo "No valid TRX firmware in the CyberTAN image"
error=1
fi
;;
"trx")
if ! otrx check "$1"; then
echo "Invalid (corrupted?) TRX firmware"
error=1
fi
;;
*)
echo "Invalid image type. Please use only .trx files"
error=1
;;
esac
return $error
}
platform_pre_upgrade() {
local file_type=$(platform_identify "$1")
local dir="/tmp/sysupgrade-bcm53xx"
local trx="$1"
local offset
[ "$(platform_flash_type)" != "nand" ] && return
# Find trx offset
case "$file_type" in
"chk") offset=$((0x$(get_magic_long_at "$1" 4)));;
"cybertan") offset=32;;
esac
# Extract partitions from trx
rm -fR $dir
mkdir -p $dir
otrx extract "$trx" \
${offset:+-o $offset} \
-1 $dir/kernel \
-2 $dir/root
[ $? -ne 0 ] && {
echo "Failed to extract TRX partitions."
return
}
# Firmwares without UBI image should be flashed "normally"
local root_type=$(identify $dir/root)
[ "$root_type" != "ubi" ] && {
echo "Provided firmware doesn't use UBI for rootfs."
return
}
# Prepare TRX file with just a kernel that will replace current one
local linux_length=$(grep "\"linux\"" /proc/mtd | sed "s/mtd[0-9]*:[ \t]*\([^ \t]*\).*/\1/")
[ -z "$linux_length" ] && {
echo "Unable to find \"linux\" partition size"
exit 1
}
linux_length=$((0x$linux_length))
local kernel_length=$(wc -c $dir/kernel | cut -d ' ' -f 1)
[ $kernel_length -gt $linux_length ] && {
echo "New kernel doesn't fit \"linux\" partition."
return
}
rm -f /tmp/null.bin
rm -f /tmp/kernel.trx
touch /tmp/null.bin
otrx create /tmp/kernel.trx \
-f $dir/kernel -b $(($linux_length + 28)) \
-f /tmp/null.bin
[ $? -ne 0 ] && {
echo "Failed to create simple TRX with new kernel."
return
}
# Prepare UBI image (drop unwanted extra blocks)
local ubi_length=0
while [ "$(dd if=$dir/root skip=$ubi_length bs=1 count=4 2>/dev/null)" = "UBI#" ]; do
ubi_length=$(($ubi_length + 131072))
done
dd if=$dir/root of=/tmp/root.ubi bs=131072 count=$((ubi_length / 131072)) 2>/dev/null
[ $? -ne 0 ] && {
echo "Failed to prepare new UBI image."
return
}
# Flash
mtd write /tmp/kernel.trx firmware
nand_do_upgrade /tmp/root.ubi
}
platform_trx_from_chk_cmd() {
local header_len=$((0x$(get_magic_long_at "$1" 4)))
echo -n dd bs=$header_len skip=1
}
platform_trx_from_cybertan_cmd() {
echo -n dd bs=32 skip=1
}
platform_do_upgrade() {
local file_type=$(platform_identify "$1")
local trx="$1"
local cmd=
[ "$(platform_flash_type)" == "nand" ] && {
echo "Writing whole image to NAND flash. All erase counters will be lost."
}
case "$file_type" in
"chk") cmd=$(platform_trx_from_chk_cmd "$trx");;
"cybertan") cmd=$(platform_trx_from_cybertan_cmd "$trx");;
esac
default_do_upgrade "$trx" "$cmd"
}
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